A California C-45 Sign license authorizes you to fabricate, install, and erect both electrical signs — including their wiring — and non-electrical signs, from post- or pole-supported signs to signs attached to structures, painted wall signs, and modifications to existing signs. That’s the classification’s exact legal scope under California Code of Regulations, Title 16, Section 832.45, authorized by Business and Professions Code Sections 7008 and 7059. It’s one of the few CSLB specialty classifications that bundles its own electrical scope directly into the definition — a C-45 contractor doesn’t need a separate C-10 license just to wire the sign itself. The facts below come from CSLB regulations, statute, and CSLB’s own examination study guide — not marketing copy.
What a C-45 License Actually Covers
The regulation is specific: a sign contractor “fabricates, installs, and erects electrical signs, including the wiring of such electrical signs, and non-electrical signs, including but not limited to: post or pole supported signs, signs attached to structures, painted wall signs, and modifications to existing signs” (CCR Title 16 §832.45). CSLB’s own C-45 exam study guide (current for exams scheduled June 1, 2024 forward) breaks the trade into five tested content areas: Planning and Estimating (22%), Sign Design and Fabrication (20%), Sign Installation (26%) — the largest single section — Testing, Maintenance, and Troubleshooting (16%), and Safety (16%). In practice, C-45 scope includes:
- Fabrication — sign patterns, sign face fabrication, channel and reverse channel letters, sign cabinets, and fluorescent, LED, HID, and neon sign fabrication and design
- Installation — excavation and concrete footings for pole and monument signs, building sign mounting, prewiring of sign electrical components, and final electrical connections
- Testing and repair — troubleshooting and repairing installed signs, and maintaining digital displays
Not sure which classification actually fits your work? Our classification finder walks through the scope differences before you commit to an exam.
How C-45 Differs From C-10, C-31, and C-8
C-10 Electrical is the classification people most often assume they still need alongside C-45. They don’t — for the sign itself. CCR §832.45 explicitly includes “the wiring of such electrical signs” in C-45’s own scope, so a licensed sign contractor can prewire, connect, and troubleshoot the electrical components of the sign they’re installing without a separate C-10 license. C-10 is still required for electrical work outside the sign’s own circuit — running new building service, a dedicated new circuit back to the panel, or unrelated site electrical work — which sign contractors commonly subcontract or coordinate with an electrician.
C-31 Construction Zone Traffic Control overlaps only on portable, temporary devices. Per CCR §832.31, C-31 covers portable changeable message signs and flashing arrow trailers deployed and removed around a work zone. C-45’s signs are permanent, fixed infrastructure — even a temporary-looking event sign that’s fabricated, erected, and left in place is C-45 scope, not C-31.
C-8 Concrete overlaps on the footings that anchor a pole or monument sign. CSLB’s C-45 study guide lists “excavation and concrete footings” directly under the Sign Installation content area, meaning small sign footings are treated as within C-45’s own scope. Larger structural concrete work unrelated to the sign foundation remains C-8 or B General Building scope.
Licensing Requirements: Experience, Bond, and Fees
Experience
CSLB requires four years of journeyman-level, foreman, supervising employee, or contractor experience in sign work within the preceding ten years. Up to three of those years can come from a relevant apprenticeship or trade school, but CSLB requires at least one full year of verifiable hands-on field experience. Claimed experience must be documented (wage records, tax forms, employer certification) per California Code of Regulations §824.
Bond and Fees
Every active license needs a $25,000 contractor’s bond on file (Business and Professions Code §7071.6, raised from $15,000 by Senate Bill 607, effective January 1, 2023 — still current in 2026). If your Responsible Managing Employee holds less than 10% ownership, or you use an RMO arrangement, CSLB also requires a separate $25,000 Bond of a Qualifying Individual.
The application fee is $450 (single classification, non-refundable regardless of outcome). After passing, the initial license fee is $200 for a sole owner or $350 for any other entity, covering the first two-year period; renewal is $450 every two years after that. Live Scan fingerprinting is a separate cost paid to the vendor, typically reported in the $70–$90 range. See current exam-prep pricing if you’re budgeting the whole path to licensure, not just CSLB’s fees.
Workers’ Compensation
Senate Bill 1455 pushed the requirement for every California licensee to carry workers’ comp regardless of employee count back to January 1, 2028. As of 2026, only five classifications are barred from filing a no-employee exemption: C-8 Concrete, C-20 HVAC, C-22 Asbestos Abatement, C-39 Roofing, and C-61/D-49 Tree Service. C-45 isn’t on that list, so a solo C-45 operator with no employees can still file the standard exemption — for now.
The C-45 Trade Exam
The C-45 exam is a separate, closed-book, computer-based test administered through PSI, distinct from the required Law and Business exam every applicant also takes. Per CSLB’s own study guide (current for exams scheduled June 1, 2024 forward), it’s multiple-choice with four options per question, one best answer, no penalty for guessing, and a calculator is provided for the math-based estimating questions. CSLB’s guide breaks content weighting into Planning and Estimating (22%), Sign Design and Fabrication (20%), Sign Installation (26%), Testing/Maintenance/Troubleshooting (16%), and Safety (16%) — CSLB itself calls these figures “approximate” and does not publish an exact question count or passing-score percentage for C-45 specifically, so this article won’t invent one. Reference materials named in CSLB’s own guide include the 2025 California Electrical Code (especially Article 600, covering electric signs), the 2025 California Building Code, and UL 48/UL 2161 standards for electric signs and neon transformers — useful background, though the exam itself is closed-book. Structured, current practice with real content matters more than a rumored percentage — the premise behind Contractor Pathway’s C-45 study guide and practice exams, one of the most competitive CSLB exam-prep programs built for this classification.
Who Needs a C-45 License?
Sign shops fabricating and installing channel letters, monument signs, and LED/digital displays; neon and electric sign specialists; pole and building-mounted sign installers; and businesses handling sign repair, relamping, and modification for existing commercial signage.
Frequently Asked Questions
Do I need a separate C-10 electrical license to wire an electric sign?
No, not for the sign itself. CCR §832.45 explicitly includes “the wiring of such electrical signs” in C-45’s own defined scope. A separate C-10 license is only needed for electrical work outside the sign’s dedicated circuit, such as running new building service back to the panel.
Does C-45 cover the concrete footing for a pole sign?
Yes. CSLB’s C-45 study guide lists “excavation and concrete footings” as part of the Sign Installation content area, so small sign foundations fall within C-45’s own scope.
What’s the difference between a C-45 sign and a C-31 portable message sign?
Permanence. C-45 signs are fabricated, erected, and left in place as fixed infrastructure. C-31’s changeable message signs and flashing arrow trailers are portable traffic control devices deployed for a construction zone and then removed.
Does the C-45 exam cover neon sign fabrication?
Yes — “Fluorescent, LED, and HID sign fabrication” and “Neon design and fabrication” are both listed under the Sign Design and Fabrication content area in CSLB’s own study guide, which CSLB weights at 20% of the exam.
Is the C-45 exam open-book?
No. CSLB’s own C-45 study guide states plainly that it is a closed-book exam — no reference materials are allowed during testing, though a calculator is provided for the math-based estimating questions.
Getting the classification right is the easy part — passing the exam is where contractors actually get stuck. See how Contractor Pathway’s prep process works, compare pricing for study packages, and if you’re still unsure which classification fits before spending the $450 application fee, reach out and we’ll help you sort it out first.